Immunity · 5 min read
Vitamin D: the daily essentials
Why D3 + K2 is the modern default — and how much you actually need.
Vitamin D3 (cholecalciferol) is the form that most efficiently raises serum 25(OH)D.
K2 (MK-7) helps direct calcium to bone tissue rather than soft tissue — a sensible pairing.
Most adults benefit from 1000–4000 IU/day depending on baseline status, latitude, and skin tone. Test if you can.